Method for partial discharge positioning through correlation coefficient and Newton-Ralfson's method
A Newton-Raphson method and partial discharge technology, applied in the direction of testing dielectric strength, etc., can solve the problems of wrong calculation, complicated calculation, unintuitive algorithm, etc., to achieve effective and accurate results.
Inactive Publication Date: 2018-03-06
江苏联能电力科学研究院有限公司
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Problems solved by technology
Although it is intuitive to judge the time difference with the naked eye, the arrival position of the wave head depends on the experience of the inspector, and some algorithms such as the cumulative energy method are not intuitive, and the calculation is complicated; when the arrival time difference is brought into the arrival time difference equation group to calculate the partial discharge space position , often due to errors in the judgment or calculation of the arrival time difference, the equation will have no solution
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[0041] The method for locating partial discharges using the correlation coefficient and the Newton-Raphson method of the present invention, the specific process is as follows:
[0042] 1) To collect partial discharge electromagnetic wave signals, the bandwidth of the oscilloscope used is 100MHz~3GHz, and its sampling rate is 5GS / s. K sensors are used to collect partial discharge electromagnetic wave signals. These k sensors are microstrip antenna sensors with a bandwidth of 100MHz~6000MHz, k sensors are arranged at equal intervals;
[0043] 2) Calculate the correlation coefficient of multiple partial discharge electromagnetic wave signals collected at the same time, and calculate the arrival time difference;
[0044] 201) Read the measurement waveform wave and wave of the reference sensor and any other sensor at the same time i , the length of waveform data is N, i=2,3,4,...,k;
[0045] 202) Calculate the cross-correlation coefficient R of two waveforms 1i , get a sequence ...
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The invention discloses a method for partial discharge positioning through a correlation coefficient and the Newton-Ralfson's method, and the method comprises the following steps: 1), collecting partial discharge electromagnetic signals at the same time through k sensors, wherein k is an integer greater than or equal to two; 2), calculating the correlation coefficient of a plurality of partial discharge electromagnetic signals collected at the same time, and calculating the arrive time difference; 3), building an equation set based on the arrival time difference, carrying out the iterative solving through employing the Newton-Ralfson's method, and obtaining the spatial coordinates of a partial discharge power supply. The method provided by the invention effectively and visually solves a calculation problem of the arrival time difference of the partial discharge electromagnetic signals, achieves the iterative solving of the arrival time difference equation set through employing the Newton-Ralfson's method, obtains an approximate solution of the spatial position of partial discharge, and avoids a condition that the equation set has no solution because of a calculation error of the time difference.
Description
technical field [0001] The invention relates to a method for locating partial discharge by using a correlation coefficient and a Newton-Raphson method, and belongs to the technical field of partial discharge detection of power equipment. Background technique [0002] The insulating material of power equipment is an important component to ensure the normal operation of power equipment, but due to the aging of the insulating material under the action of a strong electric field or the processing defect of the insulating material, partial discharge will occur inside the insulating material during the operation of the power equipment, and the development of partial discharge will be accelerated. The aging of insulating materials will shorten the life of power equipment, so it is necessary to find the location of partial discharge as soon as possible, which will help reduce the accident rate of power equipment and ensure the normal operation of power equipment. [0003] The partia...
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Inventor 何源姚健赵煦朱宇萌钱雅倩冒宝佳
Owner 江苏联能电力科学研究院有限公司